Loaded Canister Test

IMPORTANT: This test can only report a pass. The Loaded Canister Test uses the oxygen sensor data or the fuel trim information in order to determine if the engine is purging large amounts of fuel vapor from the EVAP canister. If large amounts of fuel vapors are being purged, this indicates that the canister is at least 60 percent full and that the system is working properly. When this is the case, the [1][2]EVAP diagnostics P0440, P0442, P0446 and P1441 pass for that trip and no further testing is done. If this test does not indicate sufficient canister loading, the Weak Vacuum Test runs.